Tourists visit the Archaeological Park of Pompeii in Italy, on April 27, 2021. Italy took a first decisive step toward a post-pandemic phase on Monday, the first day of reopening amid decreasing coronavirus cases. (Photo: Xinhua)

A tourist visits the Archaeological Park of Pompeii in Italy, on April 27, 2021. Italy took a first decisive step toward a post-pandemic phase on Monday, the first day of reopening amid decreasing coronavirus cases. (Photo: Xinhua)

A tourist visits the Archaeological Park of Pompeii in Italy, on April 27, 2021. Italy took a first decisive step toward a post-pandemic phase on Monday, the first day of reopening amid decreasing coronavirus cases. (Photo: Xinhua)

Tourists visit the Archaeological Park of Pompeii in Italy, on April 27, 2021. Italy took a first decisive step toward a post-pandemic phase on Monday, the first day of reopening amid decreasing coronavirus cases. (Photo: Xinhua)

Tourists visit the Archaeological Park of Pompeii in Italy, on April 27, 2021. Italy took a first decisive step toward a post-pandemic phase on Monday, the first day of reopening amid decreasing coronavirus cases. (Photo: Xinhua)

Tourists visit the Archaeological Park of Pompeii in Italy, on April 27, 2021. Italy took a first decisive step toward a post-pandemic phase on Monday, the first day of reopening amid decreasing coronavirus cases. (Photo: Xinhua)

Tourists visit the Archaeological Park of Pompeii in Italy, on April 27, 2021. Italy took a first decisive step toward a post-pandemic phase on Monday, the first day of reopening amid decreasing coronavirus cases. (Photo: Xinhua)

Tourists visit the Archaeological Park of Pompeii in Italy, on April 27, 2021. Italy took a first decisive step toward a post-pandemic phase on Monday, the first day of reopening amid decreasing coronavirus cases. (Photo: Xinhua)

A tourist visits the Archaeological Park of Pompeii in Italy, on April 27, 2021. Italy took a first decisive step toward a post-pandemic phase on Monday, the first day of reopening amid decreasing coronavirus cases. (Photo: Xinhua)

Tourists visit the Archaeological Park of Pompeii in Italy, on April 27, 2021. Italy took a first decisive step toward a post-pandemic phase on Monday, the first day of reopening amid decreasing coronavirus cases. (Photo: Xinhua)